misshapen vs malformed

misshapen and malformed both are adjectives.

Word	Noun	Adjective	Verb	Adverb
misshapen	No	Yes	No	No
malformed	No	Yes	No	No

As adjectives, misshapen and malformed are synonyms defined as:

Other synonyms of misshapen include deformed, distorted, ill-shapen.

misshapen (adjective)	malformed (adjective)
so badly formed or out of shape as to be ugly	so badly formed or out of shape as to be ugly